• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

What are drugs? A drug is a substance which alters the way the body works. Drugs which affect the brain fall into four main categories: Stimulants, Sedatives, Hallucinogens and Painkillers.

Extracts from this document...

Introduction

What are drugs? A drug is a substance which alters the way the body works. Drugs which affect the brain fall into four main categories: Stimulants, Sedatives, Hallucinogens and Painkillers. Stimulants These drugs speed up the brain and make you alert. They include Amphetamines which were used for relieving blocked noses. Cocaine is one of them, found in the leaves off certain South American plants. Coffee and tea also contain caffeine (also a stimulant). Nicotine is also a stimulant, found in tobacco. ...read more.

Middle

Drugs in this category include Cannabis, and LSD (lysergic acid diethylamide). These drugs can produce nightmares, and sometimes fatal accidents Pain Killers These stop you from feeling pain. They include mild drugs such as aspirin to strong drugs, like heroin and Morphine, which are taken from opium (poppy seeds). Morphine is given to people who have been injured, or have a strong illness. Why Are Drugs Dangerous? Drugs can be helpful if they are taken under doctors orders. However, if a wrong dose is taken, it can be very harmful. There may be three main reasons for this. ...read more.

Conclusion

An experienced driver also tried to get his 2.44m bus into a 2.03m gap. Damage the body Drugs are poisons and can kill cells. Alcohol kills cells in the Brain and liver - Prolonged drinking can cause Cirrhosis, where the liver cells are replaced by useless fibrous tissue. Aspirin can also damage the stomach lining. Dependent on Drugs The Body can also become dependent on drugs. Nicotine and Cannabis can become habit forming. You become psychologically dependent on the Drugs. Heroin and Alcohol are worse, if the person does not get it, the drug can produce withdrawal symptoms such as vomiting and dizziness. The person has become psychologically dependent, or addicted to the drug. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Humans as Organisms section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Here's what a star student thought of this essay

3 star(s)

Response to the question

This essay offers a solid outline to drugs and their effect on the body, however there is plenty of room for improvement. I like how the essay is structured, offering a categorisation of drugs in the introduction and then an ...

Read full review

Response to the question

This essay offers a solid outline to drugs and their effect on the body, however there is plenty of room for improvement. I like how the essay is structured, offering a categorisation of drugs in the introduction and then an explanation of each. I would've like to have seen an exploration of the difference between legal and illegal drugs.

Level of analysis

The analysis is sound, but could be much more detailed. For example, when discussing that cocaine is a stimulant, I would've mentioned that it increases neurotransmission across the synapses. It is key to show understanding of the effects beyond "speed up the brain and make you alert". When mentioning stimulants, I like to note they increase motivation, heart rate, blood pressure, productivity and make you feel as if you need less sleep - this enables a good link to caffeine, allowing you to comment on why it is so popular in the morning! Such links to real-world applications will gain credit. When talking about drugs being dangerous, I would've hoped the discussion would be more sophisticated. Talking about alcohol and bus drivers isn't a strong example, whereas a teenager needing their stomach pumped is. An exploration of why dependency on drugs occurs, and why it is so difficult to stop addictions, would have been a useful area to gain marks. A common flaw when students talk about addiction is that they think heroine, nicotine and alcohol are the only examples. In my opinion, discussing an addiction to caffeine shows a full understanding of dependency.

Quality of writing

This essay is structured well and the clear sections makes it easy to follow. I would've liked to have seen a few more scientific terms - this feels like more of a PSHE essay than a biology investigation. Spelling, punctuation and grammar are fine throughout.


Did you find this review helpful? Join our team of reviewers and help other students learn

Reviewed by groat 13/02/2012

Read less
Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Humans as Organisms essays

  1. Marked by a teacher

    Biology Revision notes - Human Biology

    5 star(s)

    Each pathogen has its own antigen; therefore the B lymphocytes take several days to produce the necessary antibodies. The B lymphocytes can become memory cells so that next time the pathogen invades, it is a quicker process. Antibodies kill bacteria and neutralize toxins.

  2. Marked by a teacher

    Investigate the effect of altitude training on the density of blood.

    4 star(s)

    The Electron Transport Chain- During various steps in Glycolysis and the Krebs cycle, the oxidation of certain molecules causes the reduction of NAD+ to NADH2 and FAD to FADH2. NADH2 and FADH2 then transfer electrons to the electron transport chain to produce additional ATPs from oxidative phosphorylation.

  1. Human biology short notes

    and forms a clot * Living cells divide and repair the wound * White blood cells collect at the wound and destroy any pathogens * The network of fibres shrinks and forms a hard dry scab that protects the wound from external damage Blood vessels Arteries Veins Size of lumen Small Large Endothelium (epithelium of lumen)

  2. An experiment to investigate the rate of anaerobic respiration of yeast in various respiratory ...

    This means there was a low concentration of Oxygen in the syringe which I had not accounted for. So in the various repeats, there would have been different concentrations of Oxygen. This would have been a confounding variable, which would have affected the results of my experiment and therefore the reliability of my conclusions and analysis.

  1. Should the cloning of humans be allowed?

    a gene ending up in the wrong place and potentially causing problems. Human cloning could possibly allow this therapeutic gene to be sent to every cell in the body. It would work by firstly creating an ordinary embryo using IVF.

  2. The aim of the experiment is to find out the effect exercise has on ...

    During exercise your heart beats faster due to the extra carbon dioxide produced by the muscles and this starts to build up in your bloodstream. The brain senses this happening, and sends out nerve impulses to the heart making it beat faster.

  1. Diabetes Type 1 and 2

    Although in spite of this too much insulin can make the blood glucose level go too low and give you hypoglycemia which is sometimes called a hypo. This can cause the feeling of sweatiness, confusion, and ill, and there is also the chance of going into a coma.

  2. Should people with diabetes 2 receive medical treatment?

    Vitamins A, D, E and K are fat soluble vitamins which are extracted from dietary fats and stored in the liver until needed so they do not need to be as regularly eaten. It is important to consume enough vitamins but can be harmful to eat too many.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work